Human Body Model (HBM)

Figure 1a shows the Human Body Model, and Figure

1b shows the current waveform it generates when dis-

charged into a low impedance. This model consists of a

100pF capacitor charged to the ESD voltage of interest

that is then discharged into the test device through a

1.5k

Ω resistor.

IEC 61000-4-2

The IEC 61000-4-2 standard covers ESD testing and

performance of finished equipment. However, it does

not specifically refer to integrated circuits. The

MAX4895E assists in designing equipment to meet IEC

61000-4-2 without the need for additional ESD-protec-

tion components.

The major difference between tests done using the

Human Body Model and IEC 61000-4-2 is higher peak

current in IEC 61000-4-2 because series resistance is

lower in the IEC 61000-4-2 model. Hence, the ESD with-

stand voltage measured to IEC 61000-4-2 is generally

lower than that measured using the Human Body Model.

Figure 1c shows the IEC 61000-4-2 model, and Figure

1d shows the current waveform for IEC 61000-4-2 ESD

Contact Discharge test.

Chip Information

PROCESS: BiCMOS

VGA Port Protector

_______________________________________________________________________________________

7

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

Cs

100pF

1M

Ω

1500

Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 1a. Human Body ESD Test Model

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

Ir

10%

0

0

AMPS

Figure 1b. Human Body Current Waveform

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

Cs

150pF

50M

Ω TO 100MΩ

330

Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 1c. IEC 61000-4-2 ESD Test Model

30ns

60ns

t

100%

90%

10%

I

Figure 1d. IEC 61000-4-2 ESD Generator Current Waveform